A:AnswerAppears to be out of stock: https://www.bestbuy.com/site/plantronics-charging-and-carrying-case-for-voyager-5200-series-black/4988900.p?skuId=4988900 YMMV with other sites.
A:AnswerBluetooth pair or if your phone is NFC compatible when the ear piece is in paring mode hold it close to the phone... I did this on my Samsung G7 Edge
A:AnswerOn initial power up, it walks you right through the steps. Otherwise, follow the written instructions. They are available on the Plantronics website if you don't have them.